NudCL2 is an Hsp90 cochaperone to regulate sister chromatid cohesion by stabilizing cohesin subunits.

NudCL2 is an Hsp90 cochaperone to regulate sister chromatid cohesion by stabilizing cohesin subunits.
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NudCL2 是 Hsp90 辅助伴侣,通过稳定粘连蛋白亚基来调节姐妹染色单体的粘连

DOI:
10.1007/s00018-018-2957-y
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发表时间:
2019-01
期刊:
Cellular and molecular life sciences : CMLS
影响因子:
--
通讯作者:
Zhou T
Zhou T
中科院分区:
其他
文献类型:
--
作者:
Yang Y;Wang W;Li M;Gao Y;Zhang W;Huang Y;Zhuo W;Yan X;Liu W;Wang F;Chen D;Zhou T

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姐妹染色单体粘连在有丝分裂期间确保染色体精确分离中起关键作用,这是由多亚基粘连蛋白复合物介导的。然而,粘连蛋白亚基稳定性的分子调控机制仍不清楚。在此,我们表明在哺乳动物细胞中,NudCL2(类NudC蛋白2)通过调节Hsp90的ATP酶活性对粘连蛋白亚基的稳定性至关重要。NudCL2的缺失会诱导有丝分裂缺陷以及姐妹染色单体过早分离,并使与NudCL2相互作用的粘连蛋白亚基不稳定。抑制Hsp90的ATP酶活性时也观察到类似的缺陷。有趣的是,异位表达Hsp90能有效挽救由NudCL2缺失诱导的粘连蛋白的蛋白质不稳定性和功能缺陷,但反之则不行。此外,NudCL2不仅与Hsp90结合,还显著调节Hsp90的ATP酶活性并促进Hsp90的分子伴侣功能。综上所述,这些数据表明NudCL2是一种此前未被描述的Hsp90辅分子伴侣,它通过稳定粘连蛋白亚基来调节姐妹染色单体粘连,为有丝分裂期间染色体的精确分离提供了一种迄今未被认识的关键机制。 本文的网络版(10.1007/s00018 - 2018 - 2957 - y)包含补充材料,可供授权用户使用。
Sister chromatid cohesion plays a key role in ensuring precise chromosome segregation during mitosis, which is mediated by the multisubunit cohesin complex. However, the molecular regulation of cohesin subunits stability remains unclear. Here, we show that NudCL2 (NudC-like protein 2) is essential for the stability of cohesin subunits by regulating Hsp90 ATPase activity in mammalian cells. Depletion of NudCL2 induces mitotic defects and premature sister chromatid separation and destabilizes cohesin subunits that interact with NudCL2. Similar defects are also observed upon inhibition of Hsp90 ATPase activity. Interestingly, ectopic expression of Hsp90 efficiently rescues the protein instability and functional deficiency of cohesin induced by NudCL2 depletion, but not vice versa. Moreover, NudCL2 not only binds to Hsp90, but also significantly modulates Hsp90 ATPase activity and promotes the chaperone function of Hsp90. Taken together, these data suggest that NudCL2 is a previously undescribed Hsp90 cochaperone to modulate sister chromatid cohesion by stabilizing cohesin subunits, providing a hitherto unrecognized mechanism that is crucial for faithful chromosome segregation during mitosis.
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